CVE-2021-21018

Magento versions 2.4.1 (and earlier), 2.4.0-p1 (and earlier) and 2.3.6 (and earlier) are vulnerable to OS command injection via the scheduled operation module. Successful exploitation could lead to arbitrary code execution by an authenticated attacker. Access to the admin console is required for successful exploitation.

Untrusted input reaches a shell command, allowing arbitrary commands to run on the host. Typical impact: code execution in the application's environment.

CVE-2021-21018 has a CVSS score of 9.1 (Critical). The vector is network-reachable, high privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (2.3.6, 2.4.1-p1); upgrading removes the vulnerable code path.

Kodem intelligence

1. What is CVE-2021-21018? CVE-2021-21018 is a critical-severity OS command injection vulnerability in magento/community-edition (composer), affecting versions < 2.3.6. It is fixed in 2.3.6, 2.4.1-p1. Untrusted input reaches a shell command, allowing arbitrary commands to run on the host.
2. How severe is CVE-2021-21018? CVE-2021-21018 has a CVSS score of 9.1 (Critical). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of magento/community-edition are affected by CVE-2021-21018? magento/community-edition (composer) versions < 2.3.6 is affected.
4. Is there a fix for CVE-2021-21018? Yes. CVE-2021-21018 is fixed in 2.3.6, 2.4.1-p1. Upgrade to this version or later.
5. Is CVE-2021-21018 exploitable, and should I be worried? Whether CVE-2021-21018 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2021-21018 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2021-21018?
   • Upgrade magento/community-edition to 2.3.6 or later
   • Upgrade magento/community-edition to 2.4.1-p1 or later

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